/***************************************************************************
 # Copyright (c) 2015-21, NVIDIA CORPORATION. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 #  * Redistributions of source code must retain the above copyright
 #    notice, this list of conditions and the following disclaimer.
 #  * Redistributions in binary form must reproduce the above copyright
 #    notice, this list of conditions and the following disclaimer in the
 #    documentation and/or other materials provided with the distribution.
 #  * Neither the name of NVIDIA CORPORATION nor the names of its
 #    contributors may be used to endorse or promote products derived
 #    from this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS "AS IS" AND ANY
 # EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 # PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 # OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 **************************************************************************/
#pragma once

#include "Core/Framework.h"
#include "Core/API/CopyContext.h"

#ifdef FALCOR_D3D12
#include "Core/API/Buffer.h"
#endif

namespace Falcor
{
    enum class RtAccelerationStructurePostBuildInfoQueryType
    {
        CompactedSize,
        SerializationSize,
        CurrentSize,
    };

    class FALCOR_API RtAccelerationStructurePostBuildInfoPool
    {
    public:
        using SharedPtr = std::shared_ptr<RtAccelerationStructurePostBuildInfoPool>;

        struct Desc
        {
            RtAccelerationStructurePostBuildInfoQueryType queryType;
            uint32_t elementCount;
        };
        static SharedPtr create(const Desc& desc);
        ~RtAccelerationStructurePostBuildInfoPool();
        uint64_t getElement(CopyContext* pContext, uint32_t index);
        void reset(CopyContext* pContext);
#if defined(FALCOR_D3D12)
        uint64_t getBufferAddress(uint32_t index);
#elif defined(FALCOR_GFX)
        gfx::IQueryPool* getGFXQueryPool() const { return mpGFXQueryPool.get(); }
#endif
    protected:
        RtAccelerationStructurePostBuildInfoPool(const Desc& desc);
    private:
        Desc mDesc;
#if defined(FALCOR_D3D12)
        size_t mElementSize = 0;
        Buffer::SharedPtr mpPostbuildInfoBuffer;
        Buffer::SharedPtr mpPostbuildInfoStagingBuffer;
        const void* mMappedPostBuildInfo = nullptr;
        bool mStagingBufferUpToDate = false;
#elif defined(FALCOR_GFX)
        Slang::ComPtr<gfx::IQueryPool> mpGFXQueryPool;
#endif
    };

    struct RtAccelerationStructurePostBuildInfoDesc
    {
        RtAccelerationStructurePostBuildInfoQueryType type;
        RtAccelerationStructurePostBuildInfoPool* pool;
        uint32_t index;
    };

}
